PostgreSQL multi INSERT...RETURNING with multiple columns - sql

Question

I`m building a database with Postgres 9.3 as a backend, having 3 tables:
table1 (user_id, username, name, surname, emp_date)
table2 (pass_id, user_id, password)
table3 (user_dt_id, user_id, adress, city, phone)
As can be seen table2 and table3 are child tables of table1.
I can extract the user_id of a newly inserted row in table1 (parent):
INSERT INTO "table1" (default,'johnee','john','smith',default) RETURNING userid;
I need to insert the newly extracted id (from table1) into user_id columns of table2 and table3 along with other data unique for those tables. Basically 3 X INSERT ...
How do I do that?

Answer 1

Use data-modifying CTEs to chain your three INSERTs. Something like this:
WITH ins1 AS (
INSERT INTO table1 (username, name, surname)
VALUES ('johnee','john','smith')
RETURNING user_id
)
, ins2 AS (
INSERT INTO table2 (user_id, password)
SELECT ins1.user_id, 'secret'
FROM ins1 -- nothing to return here
)
INSERT INTO table3 (user_id, adress, city, phone)
SELECT ins1.user_id, ...
FROM ins1
RETURNING user_id;
It's typically best to add a column definition list for INSERTs (except for special cases). Else, if the table structure changes, your code might break in surprising ways.
I omitted columns where you would just enter DEFAULT. Defaults are inserted automatically. Shorter, same result.
The final, optional RETURNING returns the resulting user_id - obviously from a sequence or some other default. It's actually the user_id from table3, but that's the same unless you have some triggers or other magic interfering.
More about data-modifying (a.k.a. "writable") CTEs:
Are SELECT type queries the only type that can be nested?

Answer 2

Insert master-detail using function
CREATE OR REPLACE FUNCTION apps.usp_bazar_list_insert_1(
ip_userid character varying,
ip_mobileno character varying,
ip_bazarlisttext text,
data_details text)
RETURNS TABLE(id integer)
LANGUAGE 'plpgsql'
COST 100
VOLATILE
ROWS 1000
AS $BODY$
DECLARE master_id integer;
BEGIN
insert into apps.bazar_list(action_by,mobile_no,bazarlisttext,action_date)
select ip_userId,ip_mobileNo,ip_bazarListText,now() returning list_id into master_id;
insert into apps.bazar_list_images(list_id,action_date,image_name)
select master_id,now(),image_name from json_populate_recordset(NULL::apps.bazar_list_images,
data_details::json);
RETURN QUERY
select 1;
END;
$BODY$;